Aeroplane propeller



June 23, 1931. c. BYER AEROPLANE PROPELLER Filed July 24, 1929 2 Sheets-Sheet 1 Inventor (Hyde Byer Attorney June 23, 1931. Q BYER AEROPLANE PROPELLER Filed July 24. 1929' 2 Sheets-Sheet I 2.

In venior LZyae Byer Byg Attorney any suitable or conventional manner.

Patented June 23, 19 31 CLYDE BYER, or Manon, innmiu AEROPLAN E PROPELLER Application filed July 24,

The present invention relates to an aeroplane propeller, and has for its prime object to provide means whereby the pitch of the propeller blades may be changed in an easy and expeditious manner.

Another very important object of the invention resides in the provision of a propeller structure of this nature, which is simple, strong and durable, thoroughly eflicient and reliable in use and operation, and otherwise well adapted to the purpose for which it is designed.

With the above and numerous other objects in view as will appear as the description proceeds, the invention resides in certain novel features of construction and in the combination and arrangement of parts, as will be hereinafter more fully described and claimed. 1

In the drawings Figure 1 is a side elevation of a propeller structure embodying the features of my invention,

Fig. 2 is a top plan view thereof,

Fi 3 is a perspective view of the slidable mem er,

Fig. 4 isan enlarged detail fragmentary 'section through the block showingl the manner in which a blade is attached t ereto,

Fig. 5 is a rear view of the slidable member and associated parts,

Fig. 6 is a sectional view through the block and Fig. 7 is a perspective view of the block.

Referring to the drawings in detail, it will be seen that the numeral 5 denotes a shaft having av longitudinally extending groove 6.

' This shaft-is adapted to be operat-ively connected with the engine of an aeroplane block 7 has a central bore 8 'with a key 9 formed therein, and this bore 8 receives the forward end of the shaft 5, and the key 9 is received in thegroove 6.

On op osite edges at the front, the block 7 is provided with threaded recesses 10 to re-' ceive threaded ends 11 of the propeller shafts 11, and lock ,pins 14 extending through the block to pass between three s threaded ends 11 to assist in securely holdof the 1929. Serial No. 380,674.

ing the shafts in engagement with the blocks, and permit rocking of the shafts.

The shafts 1111 have their smooth portions receivable in longitudinally extending sockets 12 formed in the respective propeller blades 12, the said shafts being provided at their inner ends with a transversely extending bore and a locking pin 37 extends through the body of the blades 12 and the bore of the respective shafts for locking the blades to the shafts, to prevent longitudinal movement of the blade on the shaft as is apparent. i Y

A U-sha ed slide S comprises a bight 15 and space parallel co-extensive sides 16.

A hub 17 extends from the center of the bight 15 in a di'rection opposite to the sides 16 and has a central bore 18 with a key 19 formed therein. The bore 18 receives the shaft 5 and a key 19 is received in the groove 6. This shaft 5 extends through the bight.

The hub 17 is provided with an annular exterior groove 20, for receiving'a sectional ring 21, the sections of which are secured together by ears 22, and fastening means 7 Pins 24 extend from the centers of the sections of the sectional ring 21 and are rockahle in an elongated loop frame 25 which terminates in apcrtured cars 26 and :27. The apertured ear 26 is pivotally mounted on a rigid arm 28 projecting forwardly from the fuselage F while a link rod :2) is pivotally ongaged with the apcrturcd cars 27 and extends back through the fuselage and is connected to a lever-30 which has associated therewith, suitable means 31 for holding it in different adjusted positions.

Obviously, by rocking the lever 30, the slide S may be moved back and forth as may be desired. Projections 32 are formed on the bight'15of the slide and at diagonally opposite corners, and extend in spaced parallelism with adjacent edges of the sides 16 so that pins 33 may pivotally connect thereto links 34 which are pivotally engaged with ears 35 projecting from the inner ends of the propeller blades 12, so that as the slide moves backian d forth, the pitch of the pro- 1 I peller-may be changed as desired.

In order to prevent longitudinal movement of the block on the shaft, a pin 36 is extendhas been disclosed in considerable detail merely for the purpose of exemplification, since in actual practice it attains the features of advantage nulnerated as desirable, in the statement of the invention and the above description.

It will be apparent, that changes in the details of construction, and in the combination and arrangement of parts, may be resorted to without departing from the spirit or scope of the invention, as hereinafter claimed, or sacrificing any of its advantages.

Having thus described my invention, what I claim as new is 1. A propeller structure of the class described mcluding, in combination, a shaft, a block fixed to. the shaft, a pair of propeller blades extending from the block in opposite directions, means for rockably engaglng the propeller blades with the block, a slide of U-shaped formation to provide a bight with a pair of spaced parallel sides projecting therefrom in one direction to straddle the block, and a hub' projecting therefrom in the opposite direction and having anannular groove, said hub and bight being circumjacent the shaftand rotatable therewith, projections on opposite corners of the bight extending in spaced parallelism with adjacent edges of the sides, links pivotally mounted between the projections and adjacent ed es of the slide, ears on the propellers with wh1ch the links are pivotally engaged, and means for sliding the slide on the shaft comprising a sectional ring seated in the groove of the hub. and provided with pins at diametrically opposite sides, an annular frame having openings for pivotally receiving said pins, an arm pivotally supporting one side of the frame and an operating lever operatively attached to the opposite side of the frame.

2. A propeller structure of the class described including, in combination, a shaft, a block fixed to the shaft, a pair of shafts rockably secured to the block and extending therefrom in opposite direction, propeller blades having bores at their inner ends for receiving said last named shaft, pins insertedtrans- ,versely of the blade and the blade shaft to prevent longitudinal movement of the blade, a slide of U-shaped formation to provide a bight and a pair of spaced parallel sides projecting therefrom, in one direction to straddle the block, a hub projecting therefrom-in the opposite direction, said hub and bight being circumjacent'the shaft and rotatable therewith, projections on opposite corners of the bight extending in spaced parallelism with adjacent edges of the sides, links pivotally mounted between the projections and adjacent edges of the slides, ears on the propellers with which the. links are pivotally engaged, said hub having an annular groove a sectional ring rotatably seated in said groove, ins projecting from diametrically opposite sldes of the ring, an annular frame having openings for pivotally receiving said pins, an

arm pivotally supporting one side of the frame and an operating lever operatively attached to the oppositesides of the frame whereby to move the slide longitudinally of said first named shaft.

In testimony whereof I aflix my signature.

CLYDE BYER. 

